Elements of inorganic chemistry : descriptive and qualitative . HYDROGEN. 35 connect the platinum wire F (which is like Z in every respect)to the platinum pole of the battery. Hydrogen collects in tubeH. and oxygen in tube 0. The hydrogen in tube H may betested by slightly opening the stop-cock Sf, and burns with a very hot flame, although it emits butlittle Queries. In which tube is the volume of gas greater ? How test theoxygen ? Exp. 23 t. Make an amalgam by rubbing, in a porcelainmortar, one-half gram metallic sodium, or potassium, togetherwith 5g mercury. Fill a
Elements of inorganic chemistry : descriptive and qualitative . HYDROGEN. 35 connect the platinum wire F (which is like Z in every respect)to the platinum pole of the battery. Hydrogen collects in tubeH. and oxygen in tube 0. The hydrogen in tube H may betested by slightly opening the stop-cock Sf, and burns with a very hot flame, although it emits butlittle Queries. In which tube is the volume of gas greater ? How test theoxygen ? Exp. 23 t. Make an amalgam by rubbing, in a porcelainmortar, one-half gram metallic sodium, or potassium, togetherwith 5g mercury. Fill a jar with water, andarrange as in Fig. 4. Placethe amalgam in a wire gauzecage, and insert under themouth of the jar. The hy-drogen liberated rises andfills the jar. Test by carefully raisingthe jar, mouth downwards,and plunging a lighted taper upward into the jar. The taper is extinguished, but thehydrogen burns at the mouth of the jar. The taper may berelighted in this flame. Usually a harmless explosion ensues. Queries. What becomes of the mercury of the amalgam after beingdipped into the water ? Drop apiece, not larger than a pea, of metallicsodium or potassium into a dish of warm water. What results ? Doyou now see the reason for amalgamating the K or Na ? What is thereason ? Is the water alkaline ? (Alkalies turn a strip of red litmuspaper, blue. Acids turn blue litmus p
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